JBIDE-14122 Add VJET to Central

VJET is added to JBT and JBDS Central

	new file:   jbdevstudio/com.jboss.jbds.central.discovery/images/vjet_32.png
	modified:   jbdevstudio/com.jboss.jbds.central.discovery/plugin.xml
	new file:   jbosstools/org.jboss.tools.central.discovery/images/vjet_32.png
	modified:   jbosstools/org.jboss.tools.central.discovery/plugin.xml